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    <div class="post-body" itemprop="articleBody"><h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><p>这是之前有一家公司招 SRE，我投了简历，然后被给了份题让先做一下，于是便有了这篇“水”文。</p>
<p>当然，最终我并没有拿到这个 offer，最早是说一周内安排面试的，后来又说是这个岗位暂停了。</p>
<span id="more"></span>

<h2 id="详情"><a href="#详情" class="headerlink" title="详情"></a>详情</h2><h3 id="第一题"><a href="#第一题" class="headerlink" title="第一题"></a>第一题</h3><p>题目有效时间只有 4 小时，当时没记下来，现在只能凭记忆力大概写一下了。</p>
<p>大概是系统有个进程在写文件 <code>/tmp/hugelog</code></p>
<h4 id="第一题第一问"><a href="#第一题第一问" class="headerlink" title="第一题第一问"></a>第一题第一问</h4><p>这一问肯定是要求将其找出来（找到 process id）</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">lsof | grep /tmp/hugelog</span><br></pre></td></tr></table></figure>

<blockquote>
<p>seeknhide  773                           root    3w      REG              252,3  6887024     655475 &#x2F;tmp&#x2F;hugelog<br>seeknhide  773  802 seeknhide            root    3w      REG              252,3  6887024     655475 &#x2F;tmp&#x2F;hugelog<br>seeknhide  773  804 seeknhide            root    3w      REG              252,3  6887024     655475 &#x2F;tmp&#x2F;hugelog<br>seeknhide  773  805 seeknhide            root    3w      REG              252,3  6887024     655475 &#x2F;tmp&#x2F;hugelog</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ps auxww | grep 773</span><br></pre></td></tr></table></figure>

<blockquote>
<p>root         773  0.0  0.2 710484  2136 ?        Sl   Jun18   0:22 &#x2F;root&#x2F;challs&#x2F;01_seeknhide&#x2F;seeknhide<br>root        5877  0.0  0.2   6608  2484 pts&#x2F;0    S+   13:53   0:00 grep –color&#x3D;auto 773</p>
</blockquote>
<p>so, the process is &#x2F;root&#x2F;challs&#x2F;01_seeknhide&#x2F;seeknhide, process id is: 773</p>
<h4 id="第一题第二问"><a href="#第一题第二问" class="headerlink" title="第一题第二问"></a>第一题第二问</h4><p>写 <code>/tmp/hugelog</code> 的程序文件已经被删除，但请算出其的 md5 码</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">readlink</span> -f /proc/773/exe</span><br></pre></td></tr></table></figure>

<blockquote>
<p>&#x2F;root&#x2F;challs&#x2F;01_seeknhide&#x2F;seeknhide (deleted)</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cp</span> /proc/773/exe a</span><br><span class="line"><span class="built_in">md5sum</span> a</span><br></pre></td></tr></table></figure>

<blockquote>
<p>eba0e82f5b454a492077c67ab89ae033  a</p>
</blockquote>
<p>so the execute file is: &#x2F;root&#x2F;challs&#x2F;01_seeknhide&#x2F;seeknhide, but it was deleted.</p>
<p>and the md5sum is: eba0e82f5b454a492077c67ab89ae033</p>
<h4 id="第一题第三问"><a href="#第一题第三问" class="headerlink" title="第一题第三问"></a>第一题第三问</h4><p>将这个 process 杀掉</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">kill</span> 773</span><br></pre></td></tr></table></figure>

<h3 id="第二题"><a href="#第二题" class="headerlink" title="第二题"></a>第二题</h3><p>有一个 app 代码项目，有代码，有 Dockerfile。</p>
<h4 id="第二题第一问"><a href="#第二题第一问" class="headerlink" title="第二题第一问"></a>第二题第一问</h4><p>需要 build 并运行一个 docker 容器，其监听主机的 8888 端口，可以用命令 <code>curl http://127.0.0.1:8888</code> 来测试（返回 <code>Hello, World!</code>）。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">cd</span> app</span><br><span class="line">docker build -t app:latest .</span><br><span class="line">docker run -it -d -p 8888:4657 app:latest</span><br><span class="line">curl http://127.0.0.1:8888</span><br></pre></td></tr></table></figure>

<blockquote>
<p>curl: (52) Empty reply from server</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># backup firstly</span></span><br><span class="line"><span class="built_in">cp</span> serve.py serve.py.ori</span><br><span class="line">vim serve.py</span><br><span class="line"><span class="comment"># change from localhost to 0.0.0.0</span></span><br></pre></td></tr></table></figure>

<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">docker build -t app:new .</span><br><span class="line"><span class="comment"># stop and delete the old container</span></span><br><span class="line">docker stop cool_germain</span><br><span class="line">docker <span class="built_in">rm</span> cool_germain</span><br><span class="line"><span class="comment"># then run it by new image</span></span><br><span class="line">docker run -it -d -p 8888:4567 app:new</span><br><span class="line"><span class="comment"># test it</span></span><br><span class="line">curl http://127.0.0.1:8888</span><br></pre></td></tr></table></figure>

<blockquote>
<p>Hello, World!</p>
</blockquote>
<h4 id="第二题第二问"><a href="#第二题第二问" class="headerlink" title="第二题第二问"></a>第二题第二问</h4><p>做了什么修改以及为什么要做这个修改。</p>
<p>我的答案是：fix it by binding host from ‘localhot’ to ‘0.0.0.0’</p>
<h3 id="第三题"><a href="#第三题" class="headerlink" title="第三题"></a>第三题</h3><p>日志文件 jwt.log 里有一些数据纪录，有些是真的，有些是假的，需要找出来真的数据纪录的条数。（有代码的要附上源码）</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> jwt</span><br><span class="line"><span class="keyword">import</span> base64</span><br><span class="line"><span class="keyword">import</span> hashlib</span><br><span class="line"><span class="keyword">import</span> hmac</span><br><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"></span><br><span class="line">secret = <span class="string">&quot;_welcome_to_chaitin_&quot;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">verify_jwt</span>(<span class="params">token</span>):</span><br><span class="line">    <span class="keyword">try</span>:</span><br><span class="line">        header, payload, signature = token.split(<span class="string">&#x27;.&#x27;</span>)</span><br><span class="line">        header_json = base64.urlsafe_b64decode(header + <span class="string">&#x27;===&#x27;</span>).decode()</span><br><span class="line">        payload_json = base64.urlsafe_b64decode(payload + <span class="string">&#x27;===&#x27;</span>).decode()</span><br><span class="line">        message = <span class="string">f&#x27;<span class="subst">&#123;header&#125;</span>.<span class="subst">&#123;payload&#125;</span>&#x27;</span></span><br><span class="line">        secret_bytes = secret.encode()</span><br><span class="line">        message_bytes = message.encode()</span><br><span class="line">        expected_signature = base64.urlsafe_b64encode(hmac.new(secret_bytes, message_bytes, hashlib.sha256).digest()).rstrip(<span class="string">b&#x27;=&#x27;</span>)</span><br><span class="line">        <span class="keyword">if</span> signature.encode() == expected_signature:</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">True</span></span><br><span class="line">    <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line">        <span class="built_in">print</span>(<span class="string">f&quot;Error verifying JWT: <span class="subst">&#123;e&#125;</span>&quot;</span>, file=sys.stderr)</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">False</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">authentic_count = <span class="number">0</span></span><br><span class="line">fake_count = <span class="number">0</span></span><br><span class="line"></span><br><span class="line"><span class="built_in">print</span>(<span class="string">&quot;Script execution started.&quot;</span>)</span><br><span class="line"><span class="keyword">with</span> <span class="built_in">open</span>(<span class="string">&#x27;jwt.log&#x27;</span>, <span class="string">&#x27;r&#x27;</span>) <span class="keyword">as</span> file:</span><br><span class="line">    <span class="keyword">for</span> line <span class="keyword">in</span> file:</span><br><span class="line">        jwt_token = line.strip()</span><br><span class="line">        <span class="keyword">if</span> verify_jwt(jwt_token):</span><br><span class="line">            authentic_count += <span class="number">1</span></span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">            fake_count += <span class="number">1</span></span><br><span class="line"><span class="built_in">print</span>(<span class="string">&quot;Script execution finished.&quot;</span>)</span><br><span class="line"></span><br><span class="line"><span class="built_in">print</span>(<span class="string">f&quot;Number of authentic JWTs: <span class="subst">&#123;authentic_count&#125;</span>&quot;</span>)</span><br><span class="line"><span class="built_in">print</span>(<span class="string">f&quot;Number of fake JWTs: <span class="subst">&#123;fake_count&#125;</span>&quot;</span>)</span><br></pre></td></tr></table></figure>

<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python3 jwt.py</span><br></pre></td></tr></table></figure>

<blockquote>
<p>Script execution started.<br>Script execution finished.<br>Number of authentic JWTs: 768<br>Number of fake JWTs: 90<br>Script execution started.<br>Script execution finished.<br>Number of authentic JWTs: 768<br>Number of fake JWTs: 90</p>
</blockquote>
<p>so, The number of authentic JWTs is: 768</p>
<h3 id="第四题"><a href="#第四题" class="headerlink" title="第四题"></a>第四题</h3><p>有个文件：<code>make_me_happy</code></p>
<h4 id="第四题第一问"><a href="#第四题第一问" class="headerlink" title="第四题第一问"></a>第四题第一问</h4><p>尽量找出这个文件相关的信息。</p>
<p>这个程序执行时会去连本地的一个接口，把这个接口找出来。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">file make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>make_me_happy: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter &#x2F;lib64&#x2F;ld-linux-x86-64.so.2, Go BuildID&#x3D;w3cEj7RamW7-qGzf3Nhs&#x2F;UpW-8zX_rMqqAZOxch9q&#x2F;g8QtiW2olQfv2K-oXiQs&#x2F;KuNmNVsa3dhXuFD3EuZR, with debug_info, not stripped</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">ls</span> -l make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>-rw-r–r– 1 root root 6777227 Feb 16  2023 make_me_happy</p>
</blockquote>
<p>has no execute permission.</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ldd make_me_happy</span><br></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">linux-vdso.so.1 (0x00007ffcd23ca000)</span><br><span class="line">libresolv.so.2 =&gt; /lib/x86_64-linux-gnu/libresolv.so.2 (0x00007fdcb92fc000)</span><br><span class="line">libc.so.6 =&gt; /lib/x86_64-linux-gnu/libc.so.6 (0x00007fdcb90d4000)</span><br><span class="line">/lib64/ld-linux-x86-64.so.2 (0x00007fdcb9319000) </span><br></pre></td></tr></table></figure>

<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">strings make_me_happy | grep -iE <span class="string">&#x27;(http|https|server|socket)://127&#x27;</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>……invalid signature: parent certificate cannot sign this kind of certificate<a target="_blank" rel="noopener" href="http://127.0.0.1:7777/pow?q=give_me_a_string_whose_sha256sum_in_hex_begins_with_%25srefusing">http://127.0.0.1:7777/pow?q=give_me_a_string_whose_sha256sum_in_hex_begins_with_%srefusing</a> to use HTTP_PROXY value in CGI environment……</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># make make_me_happy excutable with /usr/bin/chmod has no execute permission</span></span><br><span class="line"><span class="comment"># using python3</span></span><br><span class="line">python3</span><br></pre></td></tr></table></figure>

<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> os</span><br><span class="line">os.chmod(<span class="string">&#x27;make_me_happy&#x27;</span>, <span class="number">0o755</span>)</span><br></pre></td></tr></table></figure>

<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">strace ./make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>……openat(AT_FDCWD, “&#x2F;root&#x2F;.config&#x2F;make_me_happy.conf”, O_RDONLY|O_CLOEXEC) &#x3D; -1 ENOENT (No such file or directory)<br>write(1, “Not OK\n”, 7Not OK</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">touch</span> /root/.config/make_me_happy.conf</span><br><span class="line">strace ./make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>……connect(7, {sa_family&#x3D;AF_INET, sin_port&#x3D;htons(7777), sin_addr&#x3D;inet_addr(“127.0.0.1”)}, 16) &#x3D; -1 EINPROGRESS (Operation now in progress)<br>epoll_ctl(4, EPOLL_CTL_ADD, 7, {events&#x3D;EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, data&#x3D;{u32&#x3D;4114591560, u64&#x3D;140651408633672}}) &#x3D; 0<br>epoll_pwait(4, [{events&#x3D;EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP|EPOLLRDHUP, data&#x3D;{u32&#x3D;4114591560, u64&#x3D;140651408633672}}], 128, 0, NULL, 0) &#x3D; 1<br>getsockopt(7, SOL_SOCKET, SO_ERROR, [ECONNREFUSED], [4]) &#x3D; 0<br>epoll_ctl(4, EPOLL_CTL_DEL, 7, 0xc0000bf074) &#x3D; 0<br>close(7)                                &#x3D; 0<br>write(1, “Not OK\n”, 7Not OK</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">nc -4l 7777 &amp;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>[1] 7379</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>GET &#x2F;pow?q&#x3D;give_me_a_string_whose_sha256sum_in_hex_begins_with_7865 HTTP&#x2F;1.1<br>Host: 127.0.0.1:7777<br>User-Agent: Go-http-client&#x2F;1.1<br>Accept-Encoding: gzip</p>
</blockquote>
<h4 id="第四题第二问"><a href="#第四题第二问" class="headerlink" title="第四题第二问"></a>第四题第二问</h4><p>想办法让这个程序在执行的时候，正确返回。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python3 server.py &amp;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>Start HTTP server on port 7777…</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./make_me_happy</span><br></pre></td></tr></table></figure>

<blockquote>
<p>127.0.0.1 - - [19&#x2F;Jun&#x2F;2024 17:19:02] “GET &#x2F;pow?q&#x3D;give_me_a_string_whose_sha256sum_in_hex_begins_with_e7ba HTTP&#x2F;1.1” 200 -<br>OK! Thank you, I’m happy now!</p>
</blockquote>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">echo</span> $?</span><br></pre></td></tr></table></figure>

<blockquote>
<p>0</p>
</blockquote>
<h4 id="第四题第三问"><a href="#第四题第三问" class="headerlink" title="第四题第三问"></a>第四题第三问</h4><p>贴出来第二问的源码（如果有的话）。</p>
<p>我的答案：</p>
<p>the whole code(server.py) is:</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> hashlib</span><br><span class="line"><span class="keyword">import</span> string</span><br><span class="line"><span class="keyword">import</span> random</span><br><span class="line"><span class="keyword">from</span> urllib.parse <span class="keyword">import</span> urlparse, parse_qs</span><br><span class="line"><span class="keyword">from</span> http.server <span class="keyword">import</span> SimpleHTTPRequestHandler, HTTPServer</span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">find_sha256_prefix</span>(<span class="params">prefix</span>):</span><br><span class="line">    <span class="keyword">while</span> <span class="literal">True</span>:</span><br><span class="line">        candidate = <span class="string">&#x27;&#x27;</span>.join(random.choices(string.ascii_letters + string.digits, k=<span class="number">16</span>))</span><br><span class="line">        sha256sum = hashlib.sha256(candidate.encode()).hexdigest()</span><br><span class="line">        <span class="keyword">if</span> sha256sum.startswith(prefix):</span><br><span class="line">            <span class="keyword">return</span> candidate</span><br><span class="line"></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">CustomHandler</span>(<span class="title class_ inherited__">SimpleHTTPRequestHandler</span>):</span><br><span class="line">    <span class="keyword">def</span> <span class="title function_">do_GET</span>(<span class="params">self</span>):</span><br><span class="line">        <span class="keyword">if</span> <span class="variable language_">self</span>.path.startswith(<span class="string">&quot;/pow&quot;</span>):</span><br><span class="line">            query_components = parse_qs(urlparse(<span class="variable language_">self</span>.path).query)</span><br><span class="line">            prefix_template = query_components.get(<span class="string">&#x27;q&#x27;</span>, [<span class="string">&#x27;&#x27;</span>])[<span class="number">0</span>]</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> <span class="string">&quot;with_&quot;</span> <span class="keyword">in</span> prefix_template:</span><br><span class="line">                prefix = prefix_template.split(<span class="string">&quot;with_&quot;</span>)[<span class="number">1</span>]</span><br><span class="line">                suffix = find_sha256_prefix(prefix)</span><br><span class="line">                response = suffix.encode()</span><br><span class="line">                <span class="variable language_">self</span>.send_response(<span class="number">200</span>)</span><br><span class="line">                <span class="variable language_">self</span>.send_header(<span class="string">&#x27;Content-type&#x27;</span>, <span class="string">&#x27;text/plain&#x27;</span>)</span><br><span class="line">                <span class="variable language_">self</span>.send_header(<span class="string">&#x27;Content-length&#x27;</span>, <span class="built_in">len</span>(response))</span><br><span class="line">                <span class="variable language_">self</span>.end_headers()</span><br><span class="line">                <span class="variable language_">self</span>.wfile.write(response)</span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">            <span class="variable language_">self</span>.send_response(<span class="number">404</span>)</span><br><span class="line">            <span class="variable language_">self</span>.end_headers()</span><br><span class="line"></span><br><span class="line"><span class="keyword">def</span> <span class="title function_">run</span>():</span><br><span class="line">    server_address = (<span class="string">&#x27;&#x27;</span>, <span class="number">7777</span>)</span><br><span class="line">    httpd = HTTPServer(server_address, CustomHandler)</span><br><span class="line">    <span class="built_in">print</span>(<span class="string">&#x27;Start HTTP server on port 7777...&#x27;</span>)</span><br><span class="line">    httpd.serve_forever()</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> __name__ == <span class="string">&quot;__main__&quot;</span>:</span><br><span class="line">    run()</span><br></pre></td></tr></table></figure>

<h2 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h2><p>这倒还真是 SRE 的题目，基本上都跟开发有关系。这里由于需要的环境简单，而且公司方面提供了一个完整的试验环境，所以所有的 python 程序我都做过测试。</p>
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